Art of making duplex escapement-wheels



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H. J. EISEN. ART 0E MAKING DUPLEX ESGAEEMENT WHEELS.

No, 515,861. Patented Mar. .6, 1894.

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. Unirse Sterns 'Ferrater @einen HERMAN JGSEPH EISEN, OF BROOKLYN, NEWYORK, ASSIGNOR TO EDNVARD A. LOGKE, OF BROOKLINE, MASSACHUSETTS.

ART OF MAKING DUPLEX ESCAPEMENT-WHEELS.

f l I SPECIFICATION forming part of Letters Patent No. 515,861, datedMarch 6, 1894.

represin ned June 2s, lees.

Serial No. 479,067. (No model.)

hand, have of necessity `been made of soft brass, so as to provide fordie-forming the impulse teeth or for bending them to bring them intotheir different planes as compared with the spur teeth or long teeth.Conse-` quently such scape-wheels "have had to be' j made comparativelyheavy and of excessive inertia in order that the delicate long teethmight resist their contacts with the balance- "arbor, and are peculiarlyliable to become bent in the hands of watch-makers so as to becomeinoperative.

machinery, and in a certain novel portion otV y said process, ashereinafter set forth and claimed.

A sheet of drawings accompanies this specication as part thereof.

Figure 1 of the drawings comprises a face view and a diametric sectionof a circular.

blank produced by lathe-turnin g, illustrating the first stage of saidprocess. Fig. 2 is a face view illustrating its second stage. Fig. 3 isa face view, `with appended representations of milling cutters, indotted lines, illustrating the third and fourth stages of the process;

. and Fig. i :is a face view of the nished pro duct.

Like letters and numbers refer to like parts in all the figures.

The blank A, Fig. 1, is produced by latheturning, and consists of a flatcircular disk having a central hub-projection l and a concentric annularange 2, preferably on one' and the saine side of the body of the disk,

which extends beyond said annular flange in the form ota wide margin 3.The blank is next passed to a punch and die of the pattern indicated byFig.`2, which represents their product. The blank as thus roughed outhas the spokes or cross 4 of the final product B, Fig. 4, together withits rinr, except the peripheral surfaces of the latter, and also thelong teeth Gin rough; the latter being formed from said margin 3 Fig. 1,by removing the interdental portions thereof, while said cross and rimare formed by punching out portions of the body of the disk, Fig. 1,between said hub projection 1 and annular flange 2. The latter are leftuntouched by the punch and die. Anurnberof the roughed out blanks, Fig.2, are next assembled in a stack, and subjected to the action of one ormore suitable milling cutters C, Fig. 3, by which the long teeth 6 areshaped as to their lateral edges, and the intermediate impulse teeth 7are formed or completed at one and the same progressive millingoperation; said impulse teeth being cut from that portion of the blankFig. 1 which is provided with said annular flange 2, so as to projectabove the plane ot said long teeth to a second plane, as

'required in duplex escapeinents, without any displacement ot the metalof the teeth. Functionless portions of said annular flange 2 remain onthe long teeth 6, as at 2 in Fig. 3. To remove these portions, eachscape-wheel is next subjected to the action of an annular 1 millingcutter, C2, Fig. 3. This cutter removes said tunctionless portions ofthe iiange 2,r`r0m two of the long teeth 6 simultaneously, asillustrated in Fig. 3, and thus rapidly completes the teeth of thescape-wheel. The bore 9 Fig. et of its yhub 1 is next drilled, whichcompletes the final product, as represented by Fig. fi.

The product is distinguished from other machine-made scape-wheels forduplex escapements in'that it is of light weight and'of hard metal asaforesaid, and furthermore by having impulse teeth which project bodilyfrom the periphery of the rim of the wheel and extend upward to aplaneabove that of the long teeth by being of extra thickness or width frombottom to top. The scape-wheel may be thus made with a greater or lessnurn- IOO berof teeth as preferred, and other like modifications willsuggest themselves to those skilled in the art.

I do not claim herein the aforesaid product of my process ofmanufacture, but claim the same in another specification of even dateherewith, in favor of which it is hereby disclalmed. I refer to myspecification forming part of an application for patent, filed J une 28,1893, Serial No. 479,068.

Having thus described the said improvement, I claim as my invention anddesire to patent under this specificationl. The method of makinghard-metal scapewheels for duplex escapements which consists inproviding a blank with a hub-projection an annular flange and a widemargin external to said flange by turning, producing the cross and rim,except as regards the peripheral surfaces of the latter, and alsoroughing said flange by a turning operation, roughing out the long teethfrom said margin by punching, and cutting all the teeth in the stack by-cuts extending inward through said flange,

substantially as hereinbefore specified.

HERMAN JOSEPH EISEN.

Witnesses:

Taos. D. RAMBAUT, ALEX. LEHMAN.

